Kvm Switch

1. A KVM switch with an expansion module slot, comprising a housing, including a receiving space, a panel disposed at a side thereof and a removable back panel disposed at another side thereof; a printed circuit board, disposed in said receiving space, comprising a controller, a switching circuit, a plurality of connectors and a plurality of wires; and an expansion module slot, disposed corresponding to said back panel, for receiving an expansion module, wherein said expansion module slot comprises a male connector a female connector or a slot for plugging a gold finger, wherein said expansion module is arranged to be plugged into said expansion module slot, and comprises a printed circuit board, a connection interface and at least one connector, wherein said connection interface is positioned at a distal end of said printed circuit board and comprises a plurality of terminals to contact while plugging into said expansion module slot, and wherein said connector is positioned at another end of said printed circuit board and protrudes out of said housing, and a plurality of wires is adapted for connecting between said connector and said connection interface.

2. The KVM switch with the expansion module slot according to claim 1 , wherein said expansion module slot has a plurality of terminals for connecting a plurality of signals including an adaptor with PS/2, USB, VGA, DVI or earphone/microphone specification.

3. The KVM switch with the expansion module slot according to claim 1 , wherein said connection interface comprises a female connector, a male connector of a gold finger.

4. The KVM switch with the expansion module slot according to claim 1 , wherein said connector comprises a PS/2 connector.

5. The KVM switch with the expansion module slot according to claim 1 , wherein said connector comprises a USB connector.

6. The KVM switch with the expansion module slot according to claim 1 , wherein said connector comprises a VGA connector.

7. The KVM switch with the expansion module slot according to claim 1 , wherein said connector comprises a DVI connector.

8. The KVM switch with the expansion module slot according to claim 1 , wherein said connector comprises a earphone/microphone connector.

9. The KVM switch with the expansion module slot according to claim 1 , wherein said KVM switch can connect a keyboard, a mouse, a monitor to a computer.

10. The KVM switch with the expansion module slot according to claim 1 , wherein said expansion module and said KVM switch are operated in a synchronized or non-synchronized mode and said panel comprises a synchronized indicator protruding out of a surface thereof.

11. The KVM switch with the expansion module slot according to claim 10 , wherein in said synchronize mode, said expansion module chooses a path along with said KVM switch, and a status is indicated by said synchronized indicator.

12. The KVM switch with the expansion module slot according to claim 10 , wherein in said non-synchronize mode, a user can select a certain path for said expansion module, and said synchronized indicator is turned off regardless of a selection of said KVM switch.